I was just reading a piece claiming that 2.4 of the world's population has some form of Bipolar disorder: "2.4 percent of the world's population may have some form of the disease, which is marked by bizarre shifts in mood, energy and activity that can affect relationships and job performance."
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So if you are sometimes tempted to think everyone else is nuts, you may be right.
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Or as Roseanne said about Charlie - "He makes me look sane."
